Compilare: user.cpp: In function ‘int main()’: user.cpp:10:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:13:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=0;i<n;i++) fscanf(fin,"%d",&v[i]); ^ user.cpp:9:14: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i,n,a,b,c,k; ^